A twist polarizer metasurface for polarization rotation by an angle of 90° is proposed and realized at microwave frequencies. The metasurface consists of sub-wavelength metallic helices arranged periodically in a single layer and operates in transmission geometry with a nearly unity cross-polarization conversion coefficient at resonance. The structure exhibits low reflectivity R<0.06 within a decade-spanning frequency range of 0.1–5.5 GHz and is insensitive to the polarization orientation of the incident wave. Moreover, it can operate with high efficiency at oblique incidence angles of up to 35°. Such twist polarizer metasurfaces are potentially applicable as electromagnetic/optical isolators and frequency-selective polarization antennas.

中文翻译：

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高透明扭曲偏振器超表面

提出并在微波频率下实现了一种用于偏振旋转 90° 角的扭曲偏振器超表面。超表面由周期性排列在单层中的亚波长金属螺旋组成，并在透射几何中运行，共振时具有几乎统一的交叉极化转换系数。该结构在 0.1-5.5 GHz 的十进制跨度频率范围内表现出低反射率 R <0.06，并且对入射波的偏振方向不敏感。此外，它可以在高达 35° 的斜入射角下高效运行。这种扭曲偏振器超表面可能适用于电磁/光隔离器和频率选择极化天线。